|
|
A205610
|
|
Number of 3 X (n+1) 0..3 arrays with every 2 X 2 subblock having the same number of equal edges as its horizontal neighbors and a different number from its vertical neighbors, and new values 0..3 introduced in row major order.
|
|
1
|
|
|
110, 1030, 9688, 95564, 946066, 9502090, 96151010, 982430426, 10112195016, 104859909328, 1094042468862, 11478802373122, 121006212428726, 1280887123146782, 13605620542741848, 144946618170994884
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 17*a(n-1) +31*a(n-2) -1380*a(n-3) +24*a(n-4) +37716*a(n-5) +28069*a(n-6) -327857*a(n-7) -359875*a(n-8) +1111408*a(n-9) +1460528*a(n-10) -1281648*a(n-11) -2003792*a(n-12) +11264*a(n-13) +365568*a(n-14).
|
|
EXAMPLE
|
Some solutions for n=4
..0..1..2..0..3....0..0..0..0..1....0..1..1..0..0....0..0..0..1..1
..3..0..1..2..1....0..1..1..0..0....0..0..1..0..1....0..1..1..1..2
..2..2..1..0..0....3..3..2..2..3....1..2..1..2..1....2..2..3..0..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|